Valve seat for gas governors and the like



323 i931. c. w. Q'UIMBY VALVE SEAT FOR GAS GOVERNORS AND THE LIKE Filed Dec Patented Oct. 13, 1931 UNITED STATES PATENT OFFICE CHARLES w. QumBY, or PHILADELPHIA, PENNSYLVANIA, ASSIGNOR 'ro E. r. Horten- ToN AND coMPANY, or PHILADELPHIA, PENNSYLVANIA, A CORPORATION or ENNSYLVA IA VALVE SEAT FOR GAS GOVERNORS AND THE LIKE Application filed December 26, 1928. Serial No. 328,627.

My invention relates to a novel leather product and to the method of preparing the same, andmoreparticularly it relates to a leather product impervious to the passage One object ofmy invention is to provide a leather product through which no gas or liquid can pass and which for this reason is capable of successful use for many purposes, such, for'example, as seats on the valves of gas governors, regulators and the like IA further object is to provide a leather product rendered'impermeable to gas or liquid by a coating or covering tenaciously held thereon, which coating or covering is characterized by its high wear-resisting qualities and its ability to withstand the action of moisture and oils.

Still another object is to provide a leather product having the strength and pliability of leather but which, due to a novel treat- I particularly desirable has not been successful because of the many minute pores in the leather through which fluids such as air or other gases pass. One particular instance of such use is found in the valve seats of gas governors 'or regulators where it is essential that the material for the seats be completely impervious to the passage of gas.

The leather product of the present invention is characterized by the presence of a j coating of cellulose ester on at least one surface of the leather piece. This coating is tenaciously held on the leather and cannot be separated from it and it, therefore, may be considered as an integral part of the leather product. The coating is unaffected by moisture and oils and increases the wearresisting qualities and the life of the leather product. I

My invention contemplates a coating or covering on the leather comprising a cellulose ester by which term I include the various nitrocelluloses as well as cellulose acetate. These compounds, or solutions of them, are known under various names such as pyroxyline, collodion, and acetate ester. The coatingmay also include various other compounds carried by the essential cellulose ester, for example, camphor or various dyes and pig ments.

In practicing the present invention, the coating or covering of cellulose ester may take the place of'the grain side of the leather, The leather to be treated is leveled and the grain of the leather removed by any suitable means such as by splitting, butfing, or slickering. The leather is then ready for the treatment which results in the coating of the cellulose ester and the resulting impermeability of'the leather product to fluids. This cellulose ester may be applied in a variety of ways.

In a preferred example, the leather surface from which the grain has been removed is treated with an organic liquid or a mixture of such liquids in which the particular cellulose ester to be applied is soluble. For example, if a'pyroxyline varnish or cement is to'be applied, the leather may be wet with a mixture of acetone, butyl acetate and ethyl acetate, various proportions being applicable. While the leather is still wet, the pyroxyline cement is applied. -The leather, moist'with the organic liquids in which the pyroxyline is soluble, absorbs the pyroxyline and the surface pores are filled with this material before the solvents have evaporated. The leather is then subjected to pressure, the time varying from a few minutes to many hours de pending upon the resultant leather product desired. This method of applying the cellulose ester insures a strong bond between the coating and the leather body and the two will not separate in use even under severe conditions.

If desired, instead of pretreating the leather with an organic liquid or a mixture of them, a relatively dilute solution of the pyroxyline or other cellulose ester may be applied to the surface of the leather from whichthe grain hasbeen removed, or to the flesh side of the-leather. The'dilute'solution Will penetrate the pores to a sufficient extent i,

to preclude the possibility of separation of the coating in use.' The'leathe'r thus-treated As an optional method may then be subjected to pressure, or treated in any manner which will give asmooth, flexiblesurface to'the product. 7 of rendering the leather impervious to the. passageyof fluids, a fibrous sheet of paper orcloth may be applied to the surface of'the leather. "A suitable organic cementor glue may be used to bind this fibrous sheet to the leather 'For example, ordinary glue may be used. b-

viously, also, the cellulose esters described 7 hereinbefore may be used effectively. In the hase 2 by presence of organic solvents,'however, an organic binder which is insoluble in the" solvent is preferred. vThe adhesive nature of the binder vbefore-drying is relied upon' to. se-

curely bindthe fibrous materialto the sur faceof the leather; 'Theproducts made inthis Way are rendered impervious to fluidsnot only by the binder but also by the fibrous she'et v In thedrawings,Figure 1 isaiperspective View: of ajvalv'e seat 1 with-a section cut away, comprising a leather-base 2: and agas-impermeable coating of celluloseiester 3 tenaciously various oils and waxes;

The leather product by this invention has I many applications." It is particularly useful "for gas'governorsror regulator's as-Vtheseats on 'the intake valves. If the product is'to be for this purpose, it is cut into the neces sarysizesandshapes-for use as seats on the" valves. These treated leather pieces close the a'perture'tightly so that no gas can pass until 7 th regulating lever which holds the piece of leather over the intake aperture is raised, causing thevreleaseof the pressure on the leather and allowing the gasto pass by forcingthe leather up. Thisraises the pressure in the governor chamber and when sufficient pressure. 1s reached," tautomatically lowers this invention, as well as in the compounds 7 used in the surface coating without depart ing from the essential features of the invention. r

valve seat forgasigovernors and the like, which is impervious to the passage of gases, comprising a leather base and a gas impermeable coating of cellulose ester 'te'ria ciously heldthereon. V f f 2. A valve seat for 'gasgovernorsand the like, which is impervious to the passage of gases, comprising a leather base having a surfacejfrom whichthe-grain has been removed,

and a gas-impermeable coating of cellulose ester in the surfaceporesi of said surface and tenaciously held thereon." in:

3. A- valve seat for gas'gover-nors'and the like, which is impervious- :to xthepassage of gases, comprising a leather base anda' fibrous sheet securely bound on the surface of, the leather by means ofan organicibindenthe; fibrous sheet and theorg aniobinder co-oper ating to render. the leather gas-impermeable:

4e. A valve seat for; gas governors and the like, which is impervious to the passage of gases, comprising'a leather base and a fibrous sheet securely bound on the surface of the leather by means of cellulose esters,j the fibrous sheet and the cellulose ester-cooperate ing to render theleather gas-impermeable.-.

' CHARLES UI the lever which' force's the'leather'back onto I the seat of the intake valve, thus closing it; Considerable modification is possible'in the method of preparing the leather product of 

